aws: replace deprecated object in terraform config

[r4f4]

This fixes the following warning message

DEBUG Warning: Argument is deprecated
DEBUG
DEBUG with aws_s3_bucket_object.ignition,
DEBUG on main.tf line 68, in resource "aws_s3_bucket_object" "ignition":
DEBUG 68: bucket = aws_s3_bucket.ignition.id
DEBUG
DEBUG Use the aws_s3_object resource instead

by using aws_s3_object instead of aws_s3_bucket_object.

[openshift-ci]

@r4f4: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-ovn-single-node	8b543d1	link	false	/test e2e-aws-ovn-single-node
ci/prow/okd-e2e-gcp-ovn-upgrade	8b543d1	link	false	/test okd-e2e-gcp-ovn-upgrade
ci/prow/okd-e2e-aws-ovn	8b543d1	link	false	/test okd-e2e-aws-ovn

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[jhixson74]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jhixson74

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